BY R J. TILLYARD. 251' 



apart, short, black, thin, somewhat hooked or turned upward 

 (see Plate xxiii., figs.5 and 6). 



Hab. — Kuranda, N,Q. Very rare; November, 1906. A single 

 male taken by Mr. F. P. Dodd. 



It is allied to A. arbustorum Tillyard, from which, however, it 

 is easily distinguished by the larger and sharper appendages; the 

 bicolorous pterostigma is a feature which I have not noted before 

 in tropical species, though it occurs more or less in all the southern 

 species. Of these latter, A. ochraceus Selys, A. collaris Selys, and 

 A. australis Selys, are all closely allied to the above. All these 

 species have the " seven-mark " not formed, so that in this 

 respect A. Doddi is just on the border line between those which 

 possess it and those which do not. The formation of the *' seven- 

 mark " is usually complete in the larger species, and incomplete 

 in the smaller. 



6. AusTROGOMPHus Risi Martin. 



(J. Total length 47 mm., abdomen 36 mm.; forewing 28-5 mm., 

 hind wing 27 mm. 



Wings: neuratio7i blackish. Pterostigma thick, black, 

 3"2mm. Membranule very minute; slight saffroning on all 

 wings from base to nodus. Nodal Indicator \ 13-14: 9-1 Ol 



i 9-li 8-I0I 



Head: et/es brown; occipital, ridge 1mm., black, hairy, 

 with a large yellow plate; vertex black, a yellow spot near 

 occiput, the black colour extending to base of front; rest oi front 

 yellow; fostclypeus black with a large yellow spot on each side 

 touching the anteclypeus which is also yellow; the black on the 

 postclypeus forms an irregular band across the face, narrow at 

 both ends and in middle, swollen in two places; labriim yellow 

 with a fine border of black carrying a row oj small yellow hairs, 

 and crossed in the middle by a black mark; labium and gence 

 yellow; mouth thickly edged with black. Thorax: prothorax 

 black, a triangular yellow a)ark on collar in front and another 

 behind, with a small yellow double spot just in front of it. Meso- 

 and metathorax jet black above; the mesepisternum marked with 

 bright orange-yellow as follows : a border-mark; interalar ridge; 



